I stand corrected on the Marcello bit ... I had somehow become convinced that this was the name of *Quinn's* husband in the essay.
I'm not convinced that Daria's naming her fantasy husband "Marcello" means she feels she has no hope of marrying Trent ... first of all, "Marcello" is in the context of American culture a made-up sort of name (probably inspired here by Marcello Mostriani [sp?]) and all part of the general "marry the glamorous Latin lover" type fantasy; secondly this was something she was writing down on paper which for all she knew Jane might have eventually seen. Finally, I think the complete exclusion of Jane and Trent from the final essay (when at least one of them was in the earlier attempts) to be a tad suspicious.
As to who would ultimately marry whom, I think that's farther in the future than this series would ever go. If this were reality I wouldn't rule a Daria-Trent marriage out, but I wouldn't expect it either. But if anything like that happened it would be years in the future, probably after Daria graduated from college.
Actually, given the hint that they'll resolve the Daria-Trent plot this season, I think Mystik Spiral's going to get a break and go on tour, putting Trent at least temporarily out of the picture. That's the obvious way to "resolve" it while keeping maneuvering room open, and it's not unrealistic (Trent's mentioned a desire to get out of Lawndale before).
Sincerely Yours, Jordan